What's the/Why is there an issue w/ Hydrocodone and curvature of the spine?

Added 4 May 2010:

10/8/08, my daughter was born via C-section. Shortly after (< 1mo.) I noticed a point on my back directly over the fused bone that connects my Herrington rods to my spine (23 yrs ago) that was completely numb. This spot was about the size of my thumb and very much like the incission across my abdomen- no feeling whatsoever when touched, but still could feel pressure. The numbness has grown > width of my arm. Fingers on both hands are numb from smallest finger (most affected) to fore finger (most feeling) always and the numbness occasionally affects index fingers. I have had very little pain w/ my back before or after surgery in 1987, despite a 62* curve at the time of surgery. Grew 2" and left w/ 12* curve at last check (circa 1989?). at age 35 (and a 19 mo old. 30# 36" toddler), I am experiencing severe back pain. it's almost as if something is loose? or "out of place"? feels almost like grinding at times. Hydrocodone was working (nonprescribed), but I just saw a caution listed about curvature of the spine while taking it? No insurance yet. Not willing to have any treatments/procedures that could prevent picking up my daughter until no other choice.